def serialize_headers(self): """HTTP headers as a bytestring.""" def to_bytes(val, encoding): return val if isinstance(val, bytes) else val.encode(encoding) headers = [ (to_bytes(key, 'ascii') + b': ' + to_bytes(value, 'latin-1')) for key, value in self._headers.values() ] # print(headers, 33333333333333333333) return b'\r\n'.join(headers)
里面的headers是一个字典,我单独拎出去把headers换成字典循环报错啊,确实字典的values()只遍历values啊那这个代码是怎么不报错的!